Defined Benefit Pension and Other Postretirement Plans - Narrative (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Expected contribution to pensions plans during remainder of fiscal year	$ 10.9
Contribution made to Pension Plan			7.0	6.4
Net cost to sponsor unfunded and non-qualified supplemental executive retirement plans	$ 0.9	$ 0.8	$ 1.7	$ 1.6